Friday, September 26, 2014
How to Charge a Lead Acid Battery Circuit Diagram
- Batteries should not be discharged below 1.8 volts per cell, as it can cause permanent damage to the cells.
- A 40 ampere-hour battery when discharged at 4—ampere rate will take 40/ 4, i.e. 10 hours to be completely discharged. Suppose the same battery is discharged at 10—amperes rate. Theoretically, it should take 40/ 10, i.e. 4 hours to get fully discharged. But in practice it 1S observed that the battery will get fully discharged within about 3% hours itself In other words, the higher the discharge rate, the lesser will become the capacity of the battery.
- A fully discharged battery needs to be charged about 1% times its full ‘capacity’, to reach a fully charged, state. In other words, a 40-AH battery being charged at 4 amperes rate will take 15 hours and not 10 hours to be fully charged Charging a partially discharged battery =· It is not possible to estimate the time needed to charge a partially discharged battery.
- The charging or discharging of a battery is ideal at 10 hours rate, which means that a 40 ampere hour battery is to be charged or discharged at 40/ 10, i.e. 4-ampere rate.
- Lead—acid battery has a voltage of 2.1 volts per cell (on load) when fully charged, which will rise up to 2.7 volts per cell while on charge. When the voltage per cell (on load) drops to 1.8 volts, the battery is considered to be fully discharged.
- However, the battery may be charged till such time as the following are observed: (a) Free gassing of the cells. (b) Battery voltage reaches its maximum value, and remains steady. (c) The specific gravity of the electrolyte (as measured by a hydrometer) reaches 1.240
- That’s why is engine starting, when the battery drains 200 to 300 amperes, the battery becomes dead’ within a few seconds of use.
Subscribe to:
Post Comments (Atom)
No comments:
Post a Comment